Śatapatha Brāhmaṇa ("of a hundred paths") 7.5.2.37

7.5.2.37

tadāhuḥ | yāṃ vai tatprajāpatireteṣām paśūnāṃ śucam pāpmānamapāhaṃsta ete pañca paśavo 'bhavaṃsta eta utkrāntamedhā amedhyā ayajñiyāsteṣām brāhmaṇo nāśnīyāttānetasyāṃ diśi dadhāti tasmādetasyāṃ diśi parjanyo na varṣuko yatraite bhavanti

As to this they say,--The pain (heat), the evil of these animals, which Pragâpati drove out, became these five animals; they, with their pith (sacrificial essence) gone out of them, are pithless, unfit for sacrifice; a Brâhmana should not eat of them: he consigns them to that region; whence Parganya does not rain in that region where these are.